The feedback message which appears when the player enters AFK or DND status

Results from a /who query, if the query has three or fewer results

Notification that a friend or guild member has logged in or gone offline

Many standard system message patterns can be found as localized format strings in FrameXML\GlobalStrings.lua (after using the AddOn Kit to extract the default interface files). When this event is received, the message has already been localized and formatted, but using the format string may be useful for parsing variables from the message.